DDW-2025-004128

May 2, 2025
Kyle Clark
Coalville City Water System
P.O. Box 188
Coalville, Utah 84017
Subject:Operating Permit, Coalville Water Treatment Plant (TP002), Water Treatment Plant Well (WS006) and Finished Water Pumps (PF002); Coalville Water System, System #22002, File #10085
Dear Kyle Clark:This letter provides a summary of the Division of Drinking Water’s decision to issue an Operating Permit for the Coalville Water Treatment Plant (WTP), WTP Well and WTP
Finished Water Pumps. The letter includes the following sections and addenda:Operating Permit for Coalville WTP (identified as TP002 in the Division’s database), WTP Well (WS006) and
WTP Finished Water Pumps (PF002)Project Overview (Addendum 1) Compliance Strategy for Achieving Surface Water Treatment Goals (Addendum 2)Summary of Surface Water Treatment Monitoring
and Reporting Regulations (Addendum 3)1.Operating Permit We have received the following information prior to issuing the Operating Permit for Coalville WTP (TP002), WTP Well (WS006)
and WTP Finished Water Pumps (PF002):
Certification of Rule Conformance with plan approval conditions by a professional engineer.
As-built or record drawings.
Satisfactory bacteriological results as evidence of proper disinfection and flushing.
Evidence of O&M manual delivery.
Water quality data — Finished water new source chemistry data and 30 days of operational data demonstrating compliance with surface water treatment rules.
We have determined that all conditions for operating permit issuance have been met. On this basis, an Operating Permit for Coalville WTP(TP002), WTP Well (WS006) and WTP Finished Water
Pumps (PF002) is hereby issued as constituted by this letter. You may now place this plant in service in your water system.
Please maintain a copy of this letter with your permanent records for future reference. On September 2, 2020, the Division granted a temporary exception for the proposed access opening
on the filtrate/backwash tank lacking a shoebox lid. The hatch installed is compliant with R309-545-14(2), Access Openings, and the exception has been resolved in the Division’s database.
Monitoring Requirements:Issuance of this Operating Permit changes this water system’s monitoring and reporting requirements. An updated monitoring schedule can be viewed anytime at waterlink.utah.gov
under the Water Monitoring section.The updated monitoring requirements for this water system are listed below. If you have any questions regarding these requirements, please contact
the appropriate Division staff listed below.For one year,
Facility with new requirements
Analyte(s) Required
# of samples
Sampling Frequency
Next Sample(s) Due
TP002 Coalville WTP
pH, Alkalinity, Calcium, Conductivity, Temperature, Chloride, Sulfate
2
Monthly
May 31, 2025
Entry Point to DS (SS001)
pH, Alkalinity, Calcium, Conductivity, Temperature, Chloride, Sulfate
1
Monthly
May 31, 2025
DS001
pH, Alkalinity, Calcium, Conductivity, Temperature, Chloride, Sulfate
2
Monthly
May 31, 2025
DS001
Lead and Copper
20
Every Six Months
June 30, 2025
TP002 Coalville WTP
Nitrate
1
Quarterly
07/01/2025-09/30/2025
Pesticides
1
Quarterly
07/01/2025-09/30/2025
Radionuclides
1
Quarterly

07/01/2025-09/30/2025
Inorganics and Metals
1
Yearly
01/01/2025-12/31/2025
Sulfate, Sodium, TDS
1
Yearly
01/01/2025-12/31/2025
Voletile Organic Contaminants
1
Yearly
01/01/2025-12/31/2025
PFAS
Collect (1) sample every 2-4 months during a 12 month period for a total of 4 samples by April 26, 2027PFAS Information and Resources:
The EPA rule for PFAS requires that either Method 533 or Method 537.1 (version 2) be used for testing. Please ensure your chosen laboratory uses one of these approved methods. The Division
has resources available to assist water systems in completing PFAS initial monitoring requirements. For more information, visit ddwpfas.utah.gov.For PFAS-related questions, please contact
John Steffan: [e-mail] | [phone]
For questions regarding source monitoring and reporting requirements, please contact David Kruse at [e-mail], [phone]. For questions regarding lead and copper / water
quality parameter monitoring requirements, please contact Dylan Martinez at [e-mail], [phone].
If you have any questions regarding this Operating Permit, please contact Julie Cobleigh, P.E., of this office, at [phone], or Michael Newberry, P.E., Permitting and Engineering
Manager, at [phone].
Sincerely,
Russell Seeley, P.E.
Assistant Director
JJC/mrn/Admin (processing)/Admin (mailing) [Initials]EnclosuresAddendum 1. Project OverviewAddendum 2. Compliance Strategy for Achieving Surface Water Treatment GoalsAddendum 3. Summary
of Surface Water Treatment Monitoring and Reporting Regulationscc:Nathan Brooks, Summit County Health Department, [e-mail] Osborn, P.E., J-U-B Engineers, [e-mail]
Clark, Coalville City Water System, [e-mail] Cobleigh, P.E., Division of Drinking Water, [e-mail] Noble, P.G., Division of Drinking Water,
[e-mail]
Luke Treutel, Division of Drinking Water, [e-mail]
David Kruse, Division of Drinking Water, [e-mail]
Dylan Martinez, Division of Drinking Water, [e-mail]
Sarah Page, Ph. D., Division of Drinking Water, [e-mail]
John Steffan, Division of Drinking Water, [e-mail] Yee, Division of Drinking Water, [e-mail]
jcobleigh 22002 10085 TP002 OPADDENDUM 1Project Overview
Coalville Water System (UTAH#22002)
Coalville Water Treatment Plant (TP002)
The Division of Drinking Water (the Division) received all of the required items for Operating Permit issuance for the Coalville Water Treatment Plant (WTP) project from both you and
your consultant, Christina Osborne, P.E. with J-U-B Engineering on April 15, 2025. The Division issued Plan Approval for this project on September 2, 2020. The project consists of the
Coalville WTP (identified as TP002 in the Division’s database), the WTP Well (WS006) and the WTP Finished Water Pumps (PF002).
Our understanding of the project is that the Coalville WTP (TP002) treats the WTP Well (WS006), which is a shallow well classified as surface water and located within the treatment plant.
Future plans include a surface water intake and river pump station to treat water from the Weber River.
Pilot testing was performed from March 25, 2017 to May 17, 2017, by Coalville City and WesTech using an AltaPac system with Toray HFU-2020N ultrafiltration modules to evaluate the effectiveness
of the selected treatment processes using water from both the Weber River and shallow groundwater in the area. The pilot testing demonstrated satisfactory results.
The Coalville WTP (TP002) consists of ultrafiltration and post-chlorination processes. The Coalville WTP (TP002) has a plant design capacity of 200 gallons per minute (gpm). The design
includes 2 trains of the ultrafiltration process, and each train can produce 200 gpm.
The treatment plant consists of the following processes in sequence:
WTP Well (WS006) - equipped to pump 300 gpm.
Pre-treatment chemical addition:
Sodium hypochlorite for oxidation of iron and manganese (not installed, for the future Weber River source)
Sodium hydroxide for pH adjustment
PolyaluminumChlorohydrate (ACH) as a coagulant to address organic matter (not installed, for future Weber River source)
Pre-strainer - Valve and Filter V-200PA Automatic Screen Filter included in the WesTech membrane skid.
Ultrafiltration – WesTech Model UFT52C, Alta Pac membrane skid; Toray HFU-2020N ultrafiltration membranes; 2 membrane trains; 12 membranes installed per train and 6 spare slots per train
for total potential future of 18 membranes per train; 200 gpm per train.
Post-chlorination – injecting sodium hypochlorite prior to the pipe loop for achieving disinfection CT.
Chemical Addition — sodium hydroxide for pH addition or corrosion inhibitor (not installed, for future Weber River source).
WTP Finished Water Pumps (PF002) - Centrifugal, redundant pumps (1 duty, 1 standby), 200 gpm each.
Pipe Loop – 560-foot pipe loop of 24-inch diameter located at the treatment plant for disinfection CT before releasing the finished water to the distribution system.
The Toray membrane modules are mounted on a skid manufactured by WesTech. The membrane process is programmed to provide automated backwash including an air scour set at regular intervals.

The backwash can also be triggered when the transmembrane pressure reaches a certain level. Pressure decay tests are programmed to run daily to verify membrane integrity via a direct
integrity test. Indirect integrity monitoring will be provided by turbidity monitoring of the individual filter effluent of each membrane train. Periodically, when more thorough cleaning
of the membranes is needed, a clean-in-place (CIP) cycle will be run using citric acid and/or sodium hypochlorite. During the CIP cleaning process, a CIP tank is used where either citric
acid or sodium hypochlorite is introduced in the tank with water. The CIP tank and CIP solution line is thoroughly flushed between each cycle to prevent interaction between incompatible
chemicals.
All chemicals meet the ANSI/NSF 60 standard. Spill containment for chemical solution tanks is provided through a trench drain, designed to handle the full volume of all chemical solution
tanks.
Backwash waste and neutralized waste will drain to the sewer system. The sewer system is owned and operated by Coalville City and is adjacent to the treatment plant. The backwash waste
and filter to waste lines extend into the floor grates below the finished grade of the building. A detailed description of the design and justification was provided by Christina Osborn,
P.E. with J-U-B Engineers, and reviewed and approved by Division staff and Division Director, Nathan Lunstad, Ph.D., P.E., to confirm the separation from the end of the pipes to the
flood rim of the trench drain (32.5 inches) meets the intent of the rule. ADDENDUM 2Compliance Strategy for Achieving Surface Water Treatment Goals
Coalville Water System (UTAH#22002)
Coalville WTP (TP002)Treatment Goals per Surface Water Treatment Rules
The Coalville WTP (TP002) consists of membrane filtration and post-chlorination processes. In the future, when the Weber River intake is added as a source, pre-chlorination for oxidation,
coagulation, pH adjustment and corrosion control processes will be included, with the current design allowing for the inclusion of these optional processes at a later time. This plant
has been designed to meet the requirements of the surface water treatment rules, as incorporated into Utah’s Rules in R309. These surface water treatment rules require removal and/or
inactivation, expressed in terms of log10 credit, of Cryptosporidium, Giardia lamblia, and viruses through treatment techniques.
The Surface Water Treatment Rule (SWTR) requires:
3.0-log10 removal/inactivation for Giardia lamblia, and
4.0-log10 removal/inactivation for virus.
The Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR) established four bin classifications for Cryptosporidium based on concentration in the source water. If a water system
has source water classified in Bin 1, LT2ESWTR requires 2.0-log10 removal forCryptosporidium. If a water system has source water in Bin 2, Bin 3, or Bin 4, LT2ESWTR requires additional
treatment, disinfection, or inactivation for Cryptosporidium, as outlined in EPA’s “Long Term 2 Enhance Surface Water Treatment Rule Toolbox Guidance Manual.”
The water source initially supplying this treatment plant is the WTP Well (WS006). The first round of sampling under LT2ESWTR shall begin immediately with a plan approved by the Division.
Once the Weber River is added as a source for TP002, it will need to begin LT2ESWTR monitoring requirements. The Coalville WTP (TP002) is designed to meet the Bin 1 requirements, i.e.,
2.0-log10 removal for Cryptosporidium. Following completion of the second round of LT2ESWTR source water monitoring required under R309-215-15(2)(b), filtered systems must recalculate
the Cryptosporidium bin concentration and report the bin classification to the Director for approval no later than 6 months after monitoring is completed. If the Bin classification has
changed, Coalville WTP (TP002) will be required to provide additional treatment, disinfection, or inactivation for Cryptosporidium.
In the event additional log removal credit is needed for a higher Bin classification, additional treatment will need to be installed. New Plan Approval would be required for any additional
treatmentCompliance StrategyPrimary FiltrationThe Coalville WTP (TP002) is using membrane filtration, Toray HFU-2020N ultrafiltration modules, for primary filtration. The Toray membranes
are skid mounted, with two membrane trains for the system.According to the Acceptance Letter of the Toray HFU-2020N Ultrafiltration Membrane dated February 19, 2014 from the California
Department of Public Health, the Toray HFU-2020N ultrafiltration membrane is credited for providing 4.0-log10 removal for Giardia lamblia and 4.0-log10 removal for Cryptosporidium if
the process is operated such that a maximum flux of 100 gal/ft2/day and a maximum trans-membrane pressure of 29 psi is not exceeded. The Division concurs with this determination.The
Division approves the Toray HFU-2020N ultrafiltration membrane as an alternative filtration technology for primary filtration under the surface water treatment rules. The Division grants
3.0-log10 credit for Giardia lamblia removal, and 2.0-log10 credit for Cryptosporidium removal for membrane filtration process.This granting of log10 credit for Giardia lamblia removal
and Cryptosporidium removal is dependent on the ongoing demonstration of performance of the Coalville WTP (TP002). This demonstration includes the daily direct integrity testing of the
membranes in accordance with R309-215-15(18)(b)(iii) and the continuous indirect testing of the membranes via continuous turbidity monitoring in accordance with R309-215-15(18)(b)(iv).

Per R309-200-5(a)(ii) and R309-530-9, the turbidity performance standard for this treatment plant is that the turbidity shall be less than 0.1 NTU 95% of the time, and shall not exceed
0.5 NTU.
Disinfection
A disinfection process was installed following the Toray ultrafiltration process to provide Primary Disinfection treatment in order to meet the 4.0-log10 removal/inactivation for virus
treatment goal for compliance with the surface water treatment rules. A disinfection CT (CT = Concentration × Contact Time) of 12 is needed to achieve the required 4-log10 inactivation
for virus at a water temperature of 0.5 oC and pH range of 6-9. Note that a different CT value is required for higher pH values or different water temperatures.
Post-chlorination of the membrane filtered water is provided by injecting sodium hypochlorite solution prior to filtered water entering the pipe loop system located at the treatment
plant. The example CT calculation provided demonstrated the CT using a minimum free chlorine residual of 0.3 ppm at the end of the pipe loop, a volume of 13,150 gallons through 560 feet
of 24-inch diameter pipe loop, a peak flow of 300 gpm and a baffling factor of 1.0. The Coalville WTP (TP002) design demonstrates it can provide an estimated disinfection CT of 13.1,
under the conditions outlined, which meets the 4.0-log10 virus inactivation requirement for the conditions of a water temperature of 0.5 oC and pH range of 6-9. These conditions demonstrate
the worst case scenario in terms of lowest anticipated chlorine residual and peak flow at build-out capacity of the ultrafiltration skids by adding additional modules.
The Coalville WTP (TP002) shall be required to demonstrate performance of the post-chlorination primary disinfection process at peak flow for each day of operation. This demonstration
will include the recording of the following parameters to perform a CT calculation of CT achieved, comparing this to CT required at the water temperature and pH and including the results
in the monthly reporting template:
Free chlorine residual and Point of Entry (POE) – measured by AE-403, with water sample provided by a 1-inch sample line tapped from the discharge location of the pipe loop.
pH – measured by AE-402, with water sample provided by a 1-inch sample line tapped from the discharge location of the pipe loop.
Temperature – measured by AE-402, with water sample provided by a 1-inch sample line tapped from the discharge location of the pipe loop.
Filtered water flow rate through pipe – measured by FE-400
Overall, the Coalville WTP (TP002) design meets the required treatment for Cryptosporidium for surface water classified as in Bin 1 under R309-215-15 of Utah’s Rules. The processes of
Toray HFU-2020N ultrafiltration membrane filtration and post-chlorination combined will achieve the treatment goals of:
3.0-log10 removal/inactivation required for Giardia lamblia,
2.0-log10 removal/inactivation required for Cryptosporidium (Bin 1 requirement), and,

4.0-log10 removal/inactivation for virus.
ADDENDUM 3
Summary of Surface Water Treatment Monitoring and Reporting Regulations
Coalville Water System (UTAH#22002)
Coalville WTP (TP002)
This Addendum summarizes the monitoring and reporting regulations related to the Coalville WTP (TP002).
Monthly Report — General
The Coalville water system (the System) is required to complete a monthly report for Coalville WTP using a template approved by the Division of Drinking Water (the Division). As a minimum,
the monthly surface water treatment plant report must include the following data and other applicable information.
Raw water pH, Temperature, turbidity, and flow rate. [R309-530-8(8)(p and (q)]
Combined filter effluent (CFE) turbidity [R309-215-9(1)(a)]
Minimum chlorineresidual of the treated water at the point of entry (POE)
Verification and calibration dates of turbidimeter(s)
Sufficient residual concentration, volume, flow, pH, and temperature readings in order to prove disinfection CT and/or Inactivation ratio demonstrating whether the log removal/inactivation
requirements are met R309-200-5(7), R309-215-15(19)
Summary of the daily direct integrity test, continuous indirect integrity test, and triggered direct integrity test results [R309-215-15(18)(b)]
Individual Filter Effluent (IFE) Flow rates. [R309-215-8(2).
Submit the surface water treatment plant report for the entire month to the Division by the 10th of the following month. This report must be submittedas an Excel file at: https://utahddwlsi.formstack.com/forms/surface_water_treatment_rule_swtr_monthly_report_submission_form.
Please contact Sarah Page, Ph.D., at [phone] or [e-mail] schedule training regarding proper reporting.
All operational records pertaining to the monthly surface water treatment plant reports shall be maintained for a minimum of 5 years. [R309-105-17]
Treatment Adequacy [R309-200-5(7), R309-215-15(19) and (20)]
Water systems using surface water or groundwater under the direct influence of surface water must provide treatment consisting of both disinfection and filtration. [R309-200-5(5)(a)].
The surface water treatment plant monthly report must include both disinfectionand filtration processes. The monthly report shall contain sufficient information to indicate whether the
minimum surface water treatment requirements (i.e., log removal/inactivation of Giardia, virus, and Cryptosporidium) are met.
Required Treatments Credit — The treatment credits required and granted for the processes in Coalville WTP (TP002) are summarized below.
Coalville Water System (UTAH#22002)
Coalville WTP (TP002)
Primary Treatment Technique: Membrane Filtration
Treatment Goals
(Minimum Treatment Requirements)
Giardia
Virus
Cryptosporidium
3.0-log removal / inactivation
4.0-log removal / inactivation
2.0-log removal
(Bin 1 source water)
Processes
Credit Granted
Membrane Filtration1 (Toray- HFU-2020N Membrane)
3.0-log
removal
-
2.0-log
removal
Chlorine3
-
4.0-log inactivation
-
Total Treatment Credit
3.0-log removal / inactivation
4.0-log
removal / inactivation
2.0-log
removal / inactivation
1.Granted based on State of California Health Department Alternative Filtration letter dated February 19, 2014.
2.Based on CT calculation supplied by Christina Osborn, P.E., of J-U-B Engineers Inc., during the plan review process and confirmed in plant operational report during start up.
Disinfection
The System is required to continuously disinfect the treated water from this WTP.
The disinfection treatment shall be sufficient to ensure the total treatment processes of this WTP achieve at least 3.0- log10 inactivation/removal of Giardia lamblia, 4.0-log10 inactivation/removal

virus, and a minimum of 2.0-log10Cryptosporidium removal (for treating Bin 1 source water). [R309-200-5(7)(a)(i); R309-215-15(12)].
The calculated disinfection CT for all processes shall be reported monthly to indicate the level of disinfection effectiveness. [R309-215-15(19)]
Disinfection at Point of Entry (POE)[R309-200-5(7), R309-215-15(19)]
The System is required to continuously disinfect the treated water from this WTP. [R309-200-5(7)]
The chlorine residual must not be below 0.2 milligram per liter (mg/L) free chlorine residual at the point of entry (POE), where the treated water enters the distribution system, for
more than four hours. [R309-200-5(7)(a)(ii)]
The chlorine residual must not exceed the maximum residual disinfectant level (MRDL) of 4.0 mg/L free chlorine residual. [R309-200-5(3)(c)(iv) Table 200-5]
Lowest Daily POE chlorine residual readings shall be collected and recorded on the monthly report.
Systems serving a population between 1,000 and 2,500 shall either continuously monitor chlorine residuals at the POE or collect 3 grab samples per day
The chlorine analyzer should be verified for accuracy or calibratedat least quarterlyper Standard Method 334.0 Determination of Residual Chlorine in Drinking Water Using an Online Chlorine
Analyzer. [EPA 815-B-09-013 September 2009 11.1.1.2 Page 13]
A Hach Pocket Colorimeter DPD colorimetric method (e.g. Method 8021) is an acceptable method for verifying on-line chlorine residual analyzers (e.g. for Hach Cl17 online analyzer). If
the verification fails, online analyzer adjustments will be made until the accuracy is achieved. A calibration will be conducted if verification testing cannot be accomplished successfully.
Turbidity Limit Issues
Filtration Technologies Other Than Conventional Filtration, Direct Filtration, Slow Sand Filtration, or Diatomaceous Earth Filtration [R309-200-5(5)(a)(ii); R309-215-9(1)]
The turbidity of the treated water or the combined filter effluent (CFE) shall be less than or equal to 0.1 NTU in at least 95% of the measurements taken each month. The treated water
or CFE turbidity shall at no time exceed 0.5 NTU.
Turbidity Monitoring and Reporting — General
The turbidity readings during the operation and maintenance procedures, such as plant start-up, clean in place, enhanced flux maintenance, air scrub, integrity tests, etc., can be excluded
from the report. Operational logs and/or SCADA shall reflect the conditions causing false turbidity readings.
If a data recording delay is programmed into SCADA after plant start-up, the delay shall not exceed 15 minutes and the System shall inform the Division of the programming details
Signal averaging is not allowed.
The turbidity of the combined filter effluent (CFE) and each individual filter effluent (IFE) shall be continuously monitored. [See R309-215-9(1)(a) for CFE monitoring, and R309-525-15(4)(b)(vi)
and (4)(c)(vii) for IFE monitoring.]
The turbidity of the combined filter effluent (CFE) and each individual filter effluent (IFE) shall be continuously recorded. [R309-215-9(1)(b)]
The System shall monitor the turbidity results of each IFE at a frequency of no greater than every 15 minutes. [R309-215-9(1)(b)]
The highest CFE turbidity reading at the end of eachfour-hour (or shorter) interval of operation must be included in the monthly surface water treatment plant report submitted to the
Division, excluding data described in #5a. [R309-215-9(1)(b)] Data must be sufficient to determine the information outlined below. [R309-215-9(1)(b); R309-215-9(1)(c), R309-215-9(4)(a)
and R309-215-9(5)(a)]
Total number of the 4-hour combined filter effluent (CFE) turbidity measurements reported during the month (see #5e)
The number and percentage of 4-hour combined filter effluent (CFE) turbidity measurements reported during the month, which are less than or equal to 0.1 NTU, excluding data described
in #5a.
The date and value of any turbidity measurement taken during the month, which exceed 0.5 NTU for a System using filtration technology other than conventional filtration, direct filtration,
slow sand filtration, or diatomaceous earth filtration.
If there is a failure in continuous monitoring equipment, the water system shall conduct grab sampling for turbidity every four hours. [R309-215-9(1)(b)]
The grab sampling, in lieu of continuous monitoring, cannot be more than fourteen days for water systems serving a population less than 10,000, following the failure of equipment.
If the set turbidity limit for the approved treatment technology is exceeded, the System must comply with the re-sampling and notification requirements. [R309-215-9(2)]
Re-sample as soon as practicable and preferably within one hour.
If re-sampling confirms the exceedance of the turbidity limit —
The System shall collect at least one bacteriological sample near the first service connection from the source within 24 hours of the turbidity exceedance. This sample result shall be
included in determining bacteriological compliance for that month.
The System shall report this turbidity re-sampling exceedance to the Director as soon as practical, but no later than 24 hours after the turbidity exceedance is known. This reporting
is in addition to reporting the incident on any monthly WTP reports.
The System using a filtration technology other than conventional filtration, direct filtration, slow sand filtration, or diatomaceous earth filtration shall inform the Division as soon
as possible, but no later than the end of the next business day if any time the combined filter effluent (CFE) turbidity in representative samples of filtered water exceeds the maximum
level set by the Director, i.e., 0.5 NTU for Coalville WTP [R309-215-9(6)(b)]
Turbidity Equipment Verification and Calibration
Continuous turbidity monitoring equipment for the combined filter effluent (CFE) and each individual filter effluent (IFE) shall be checked for accuracy and re-calibrated at a minimum
frequency of monthly. [R309-215-9(1)(d)]
The turbidimeter shall be calibrated andthe accuracy verified at least once per month.
The turbidimeters should be thoroughly cleaned and calibrated with primary standardsat least quarterly.
It is not allowed to calibrate on-line instruments by comparison with a bench-top turbidimeter.
The most recent verification/calibration date for the CFE turbidimeter and each IFE turbidimeter shall be reported on the monthly report.
Membrane Filtration — Direct Integrity Testing [R309-215-15(18)(b)(iii)]
The direct integrity test must be independently applied to each membrane unit in service.
The direct integrity test must have a sensitivity sufficient to verify the log treatment credit awarded. This sensitivity level or pass/fail criteria should be agreed upon by the Division
and the water system based on the manufacturer recommendation or other testing.
The water system must establish a control limit within the sensitivity limits of the direct integrity test indicative of an integral membrane unit capable of meeting the removal credit
awarded.
If the result of a direct integrity test exceeds the control limit, the System must remove the membrane unit from service. The System must conduct a direct integrity test to verify any

repairs, and may return the membrane unit to service only if the direct integrity test is within the established control limit.
Within 24 hours of plant operation, a direct integrity test must be conducted. The System must conduct direct integrity test on each membrane module no less than once each day that the
membrane unit is in continuous operation, excluding the data described in #5a.
The System must submit a monthly report to the Director summarizing all excursions above the established control limit, the triggered direct integrity testing, and the action taken in
each case. [40CFR 141.721(f)(10)(ii)(B)]
Membrane Filtration — Indirect Integrity Testing [R309-215-15(18)(b)(iv)]
The System must conduct continuous indirect integrity monitoring (i.e., continuous filtrate turbidity monitoring) of individual membrane units (IFE) and combined filter effluent (CFE).
Continuous filtrate turbidity monitoring must be conducted at a frequency of no less than once every 15 minutes. [40CFR 141.719(b)(4)(ii) and (iii)]
If the filtrate turbidity readings are above 0.15 NTU for a period greater than 15 minutes (i.e., two consecutive 15-minute readings above 0.15 NTU), excluding the data described in
#5a, direct integrity testing must immediately be performed on the associated membrane unit. [R309-215-15(18)(b)(iv)(D)]
Source Water Bin Classification
The source water WTP Well (WS006) of the Coalville WTP (TP002) has not yet received a Bin classification. Bin sampling is required to determine if the source water is classified as Bin
1 with respect to R309-215-15.
Coalville Water System must conduct an initial and a second round of source water monitoring for the WTP Well (WS006) source. If the Coalville WTP (TP002) practices recycling, the sampling
must be from a location after the recycle stream combines with the raw water and prior to any chemical addition. This monitoring may include sampling for Cryptosporidium, E. coli, and
turbidity as described in R309-215-15(2) through R309-215-15(7), to determine what level, if any, of additional Cryptosporidium treatment that must be provided. Please contact Sarah
Page at [phone] or [e-mail] as soon as possible to begin this monitoring requirement.